From owner-freebsd-hackers Tue Sep 17 18:57:37 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id SAA09197 for hackers-outgoing; Tue, 17 Sep 1996 18:57:37 -0700 (PDT) Received: from dyson.iquest.net (dyson.iquest.net [198.70.144.127]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id SAA09157; Tue, 17 Sep 1996 18:57:32 -0700 (PDT) Received: (from root@localhost) by dyson.iquest.net (8.7.5/8.6.9) id UAA03535; Tue, 17 Sep 1996 20:55:45 -0500 (EST) From: "John S. Dyson" Message-Id: <199609180155.UAA03535@dyson.iquest.net> Subject: Re: attribute/inode caching To: terry@lambert.org (Terry Lambert) Date: Tue, 17 Sep 1996 20:55:45 -0500 (EST) Cc: dyson@freebsd.org, terry@lambert.org, dyson@celebration.net, dg@Root.COM, bde@zeta.org.au, proff@suburbia.net, freebsd-hackers@freebsd.org In-Reply-To: <199609172311.QAA05000@phaeton.artisoft.com> from "Terry Lambert" at Sep 17, 96 04:11:55 pm Reply-To: dyson@freebsd.org X-Mailer: ELM [version 2.4 PL24 ME8] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk > > > I have saved the original correspondence (or you can look it up in the > > > -current list archives, which I suggest you do so that there is no question > > > of me biasing the information) where we originally discussed the vclean > > > interface. In it, you claimed that device/extent and vnode/extent > > > mapping were irreconcilable because the device/extent mapping would > > > cause a reduction in the mappable region down to 2^31, the max filesize > > > (clearly, 31 pages == 4096/512 + 31 bits of blocks -- the origin of the 39). > > > > > maxfilesize is in units of bytes, right? > > Yes. > VM system addressibility is (2^31) * PAGE_SIZE = 2^43; I/O system addressibility is (2^31) * DEV_BSIZE = 2^40. There may have been some implementation limitations in the past, but those have been fixed (AFAIK.) John